US4179181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared reflecting articles
Assignee: Cabot Safety Intermediate LLC
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Filing: 1978-04-03
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Granted: 1979-12-18
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Expires: 1998-04-03
Abstract
Abstract Articles having an interference coating which reflects infrared energy are disclosed. The coating has a period of three layers in which the first and third layers are a refractory dielectric material and the intermediate, or second layer, is silver. If the period is repeated once, the cut-off between transmission and reflection is sharper than the coating having a single period.
Inventors
- 👤 Leei Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:46
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/281; G02B5/282
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
44 words
An interference-coated, infrared reflecting article comprising, in sequence, (a) a substrate having a surface, (b) a first layer of a refractory dielectric, (c) a layer of silver having a thickness between about 110 and 250 A, (d) a second layer of the refractory dielectric.
Claim 2
Dependent Claim
44 words
An interference-coated, infrared reflecting article comprising, in sequence, (a) a substrate having a surface, (b) a first layer of a refractory dielectric, (c) a layer of silver having a thickness between about 110 and 250 A, (d) a second layer of the refractory dielectric.
Claim 3
Dependent Claim
15 words
The article according to claim 1 wherein (b), (c) and (d) are repeated in sequence.
Claim 4
Dependent Claim
14 words
The article according to claim 2 wherein (b) and (d) are SiO x .
Claim 5
Dependent Claim
77 words
The article according to claim 2 wherein (a) is a synthetic resin, selected from the group consisting of polycarbonate, poly (allyl diglycol carbonate), and polymethyl methacrylate, (b) and (d) are a material selected from the group consisting of SiO, SiO 1 .5, SiO 2 and mixtures thereof and have a thickness of about 110 to about 250 A, and (b), (c) and (d) are repeated once to provide the order (a) (b) (c) (d) (b) (c) (d).
Claim 6
Dependent Claim
15 words
The article according to claim 4 wherein the surface of (a) is coating with SiO.
Claim 7
Dependent Claim
23 words
The article of claim 4 wherein the surfaces of (b) and (c) are coated with palladium before coating with (c) and (d) respectively.
Claim 8
Dependent Claim
15 words
The article according to claim 4 further including a final coating of an abrasion-resistant material.
Claim 9
Dependent Claim
17 words
The article according to claim 10 wherein each (b) and (d) layer is about 180 A thick.
Claim 10
Dependent Claim
23 words
The article according to claim 1 wherein said substrate is glass and the refractory dielectric has an index of refraction at least 1.6.
Claim 11
Dependent Claim
33 words
The article in claim 1 wherein said substrate is a transparent plastic having a layer of SiO on the surface and the refractory dielectric has an index of refraction of at least 1.6.
Claim 12
Dependent Claim
44 words
The article according to claim 1 wherein said dielectric is selected from the group consisting of TiO 2 , CeO 2 , ZrO 2 , Nd 2 O 3 , MgO, Al 2 O 3 and SiO x where x is 1 to 2.
Claim 13
Dependent Claim
16 words
The article according to claim 1 wherein (c) is about 140 to about 220 A thick.
Claim 14
Dependent Claim
16 words
The article according to claim 1 further including a final coating of an abrasion resistant material.
Claim 15
Dependent Claim
17 words
The article according to claim 1 further including an adhesion promoting material under one of the layers.
Claim 16
Independent Claim
54 words
A method of treating a substrate to cause it to reflect infrared light which comprises, (1) coating the substrate with a refractory dielectric material, (2) coating the material of step 1 with about 110 to about 250 A of silver, and (3) coating the silver of step 2 with the refractory dielectric of 1.
Claim 17
Independent Claim
54 words
A method of treating a substrate to cause it to reflect infrared light which comprises, (1) coating the substrate with a refractory dielectric material, (2) coating the material of step 1 with about 110 to about 250 A of silver, and (3) coating the silver of step 2 with the refractory dielectric of 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |